import * as os from 'os';
import * as path from 'path';
import * as repl from 'repl';
import { fileURLToPath } from 'url';
import { promisify } from 'util';

import { quickLoadAllFromYAML } from './data/yaml.js';
import { logError, parseOptions } from './util/cli.js';
import { showAggregate } from './util/sugar.js';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

async function main() {
    const miscOptions = await parseOptions(process.argv.slice(2), {
        'data-path': {
            type: 'value'
        },

        'show-traces': {
            type: 'flag'
        },

        'no-history': {
            type: 'flag'
        },
    });

    const dataPath = miscOptions['data-path'] || process.env.HSMUSIC_DATA;
    const showAggregateTraces = miscOptions['show-traces'] ?? false;
    const disableHistory = miscOptions['no-history'] ?? false;

    if (!dataPath) {
        logError`Expected --data-path option or HSMUSIC_DATA to be set`;
        return;
    }

    console.log('HSMusic data REPL');

    const wikiData = await quickLoadAllFromYAML(dataPath);
    const replServer = repl.start();

    Object.assign(
        replServer.context,
        wikiData,
        {wikiData, WD: wikiData}
    );

    if (disableHistory) {
        console.log(`\rInput history disabled (--no-history provided)`);
        replServer.displayPrompt(true);
    } else {
        const historyFile = path.join(os.homedir(), '.hsmusic_repl_history');
        replServer.setupHistory(historyFile, err => {
            if (err) {
                console.error(`\rFailed to begin locally logging input history to ${historyFile} (provide --no-history to disable)`);
            } else {
                console.log(`\rLogging input history to ${historyFile} (provide --no-history to disable)`);
            }
            replServer.displayPrompt(true);
        });
    }
}

main().catch(error => {
    if (error instanceof AggregateError) {
        showAggregate(error)
    } else {
        console.error(error);
    }
});
